FREQUENCY OF POSITIVE ANTIBODY INDECES (AIs) FOR MEASLES, RUBELLA, ZOSTER
Applied threshold defining a positive AI	≥1.5	>2.0	≥1.5	>2.0	≥1.5	>2.0
Positive AIs (Measles), n (%)	4 (10)	2 (5)	40 (58.8)	31 (45.6)	p < 0.0001	p < 0.0001
Positive AIs (Rubella), n (%)	4 (10)	2 (5)	33 (48.5)	27 (39.7)	p < 0.0001	p < 0.0001
Positive AIs (Zoster), n (%)	5 (12.5)	3 (7.5)	30 (44.1)	21 (30.9)	p = 0.0006	p = 0.0043
FREQUENCY OF PATIENTS WITH 0, 1, 2, 3 POSITIVE ANTIBODY INDECES (AI)
Applied threshold defining a positive AI	≥1.5	>2.0	≥1.5	>2.0	≥1.5	>2.0
0 positive AI, n (%)	32 (80)	35 (88)	13 (19.1)	21 (30.9)	p < 0.0001	p < 0.0001
1 positive AI, n (%)	3 (7.5)	3 (7.5)	18 (26.5)	22 (32.4)	p = 0.0221	p = 0.0039
2 positive AIs, n (%)	3 (7.5)	1 (2.5)	19 (27.9)	16 (23.5)	p = 0.0128	p = 0.0048
3 positive AIs, n (%)	2 (5)	1 (2.5)	18 (26.5)	9 (13.2)	p = 0.0049	n.s.

AI, antibody index; ANA, antinuclear antibody; ANCA, anti-neutrophil cytoplasmic antibodies; APA, antiphospholipid antibodies; dsDNA, double stranded DNA; IIF, indirect immunofluorescence; M, measles; MS, multiple sclerosis; n, number of patients; n.s., not significant; RDwCNS, rheumatic diseases with involvement of the central nervous system; R, rubella; SD, standard deviation; Z, varicella zoster. The bold values are the applied thresholds (>1.5 or >2.0) defining a positive AI for the calculation of the MRZR.